try:
    results = int(input('输入成绩:'))
    if 90 <= results <= 100:
        print('秀儿')
    elif 80 <= results < 90:
        print('良')
    elif 70 <= results < 80:
        print('良')
    elif 60 <= results < 70:
        print('及格')
    elif 0 > results or results > 100:
        print('输入错误！！')
    else:
        print('就这点分')

except ValueError:
    print("您输入的不是数字，请再次尝试输入！")
